<html lang='en'>

<head>
  <meta charset='UTF-8'>
  <meta http-equiv='X-UA-Compatible' content='IE=edge'>
  <meta name='viewport' content='width=device-width, initial-scale=1.0'>
  <title>Document</title>
  <script src='https://cdn.jsdelivr.net/npm/vue/dist/vue.js'></script>

</head>

<body>
  <div id='root'>

    姓名：<input type="text" v-model="name">
    <div>{{name}}</div>
  </div>
  <script>
    Vue.config.productionTip = true
    let vm = new Vue({
      el: '#root',
      data: {
        name: "张三"
      },
      methods: {
      }
    })
  </script>

  <body>

</html>